147177778381 has 2 divisors, whose sum is σ = 147177778382. Its totient is φ = 147177778380.

The previous prime is 147177778379. The next prime is 147177778417. The reversal of 147177778381 is 183877771741.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 105565858281 + 41611920100 = 324909^2 + 203990^2 .

It is a cyclic number.

It is not a de Polignac number, because 147177778381 - 2¹ = 147177778379 is a prime.

It is a super-2 number, since 2×147177778381² (a number of 23 digits) contains 22 as substring.

Together with 147177778379, it forms a pair of twin primes.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (147177778301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 73588889190 + 73588889191.

It is an arithmetic number, because the mean of its divisors is an integer number (73588889191).

Almost surely, 2^147177778381 is an apocalyptic number.

It is an amenable number.

147177778381 is a deficient number, since it is larger than the sum of its proper divisors (1).

147177778381 is an equidigital number, since it uses as much as digits as its factorization.

147177778381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12907776, while the sum is 61.

The spelling of 147177778381 in words is "one hundred forty-seven billion, one hundred seventy-seven million, seven hundred seventy-eight thousand, three hundred eighty-one".