215402434031677 has 2 divisors, whose sum is σ = 215402434031678. Its totient is φ = 215402434031676.

The previous prime is 215402434031623. The next prime is 215402434031683. The reversal of 215402434031677 is 776130434204512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 210895861240516 + 4506572791161 = 14522254^2 + 2122869^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215402434031677 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 215402434031677.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215402434031977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107701217015838 + 107701217015839.

It is an arithmetic number, because the mean of its divisors is an integer number (107701217015839).

Almost surely, 2^{215402434031677} is an apocalyptic number.

It is an amenable number.

215402434031677 is a deficient number, since it is larger than the sum of its proper divisors (1).

215402434031677 is an equidigital number, since it uses as much as digits as its factorization.

215402434031677 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3386880, while the sum is 49.

The spelling of 215402434031677 in words is "two hundred fifteen trillion, four hundred two billion, four hundred thirty-four million, thirty-one thousand, six hundred seventy-seven".