147778279775281 has 27 divisors (see below), whose sum is σ = 159366167207211. Its totient is φ = 137011676547024.

The previous prime is 147778279775257. The next prime is 147778279775297. The reversal of 147778279775281 is 182577972877741.

The square root of 147778279775281 is 12156409.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 21710549025 + 147756569226256 = 147345^2 + 12155516^2 .

It is not a de Polignac number, because 147778279775281 - 2¹¹ = 147778279773233 is a prime.

It is a super-2 number, since 2×147778279775281² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 147778279775195 and 147778279775204.

It is not an unprimeable number, because it can be changed into a prime (147778279775251) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 10855666431 + ... + 10855680043.

Almost surely, 2^{147778279775281} is an apocalyptic number.

147778279775281 is the 12156409-th square number.

147778279775281 is the 6078205-th centered octagonal number.

It is an amenable number.

147778279775281 is a deficient number, since it is larger than the sum of its proper divisors (11587887431930).

147778279775281 is an frugal number, since it uses more digits than its factorization.

147778279775281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27358 (or 13679 counting only the distinct ones).

The product of its digits is 5421265920, while the sum is 82.

The spelling of 147778279775281 in words is "one hundred forty-seven trillion, seven hundred seventy-eight billion, two hundred seventy-nine million, seven hundred seventy-five thousand, two hundred eighty-one".