158275869921 has 45 divisors (see below), whose sum is σ = 250035290895. Its totient is φ = 96436173600.

The previous prime is 158275869883. The next prime is 158275869931. The reversal of 158275869921 is 129968572851.

The square root of 158275869921 is 397839.

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

158275869921 is a `hidden beast` number, since 1 + 5 + 8 + 27 + 586 + 9 + 9 + 21 = 666.

It can be written as a sum of positive squares in 7 ways, for example, as 2387025 + 158273482896 = 1545^2 + 397836^2 .

It is not a de Polignac number, because 158275869921 - 2⁷ = 158275869793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (158275869931) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 1567087771 + ... + 1567087871.

Almost surely, 2^158275869921 is an apocalyptic number.

158275869921 is the 397839-th square number.

158275869921 is the 198920-th centered octagonal number.

It is an amenable number.

158275869921 is a deficient number, since it is larger than the sum of its proper divisors (91759420974).

158275869921 is an frugal number, since it uses more digits than its factorization.

158275869921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 436 (or 117 counting only the distinct ones).

The product of its digits is 21772800, while the sum is 63.

It can be divided in two parts, 158275 and 869921, that added together give a square (1028196 = 1014²).

The spelling of 158275869921 in words is "one hundred fifty-eight billion, two hundred seventy-five million, eight hundred sixty-nine thousand, nine hundred twenty-one".