2179169157961 has 2 divisors, whose sum is σ = 2179169157962. Its totient is φ = 2179169157960.

The previous prime is 2179169157953. The next prime is 2179169157983. The reversal of 2179169157961 is 1697519619712.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1411058894400 + 768110263561 = 1187880^2 + 876419^2 .

It is a cyclic number.

It is not a de Polignac number, because 2179169157961 - 2³ = 2179169157953 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2179169157893 and 2179169157902.

It is not a weakly prime, because it can be changed into another prime (2179169157941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1089584578980 + 1089584578981.

It is an arithmetic number, because the mean of its divisors is an integer number (1089584578981).

Almost surely, 2^{2179169157961} is an apocalyptic number.

It is an amenable number.

2179169157961 is a deficient number, since it is larger than the sum of its proper divisors (1).

2179169157961 is an equidigital number, since it uses as much as digits as its factorization.

2179169157961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12859560, while the sum is 64.

The spelling of 2179169157961 in words is "two trillion, one hundred seventy-nine billion, one hundred sixty-nine million, one hundred fifty-seven thousand, nine hundred sixty-one".