2157666860077 has 2 divisors, whose sum is σ = 2157666860078. Its totient is φ = 2157666860076.

The previous prime is 2157666860071. The next prime is 2157666860101. The reversal of 2157666860077 is 7700686667512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1215872307556 + 941794552521 = 1102666^2 + 970461^2 .

It is a cyclic number.

It is not a de Polignac number, because 2157666860077 - 2³⁵ = 2123307121709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2157666859997 and 2157666860024.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2157666860071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1078833430038 + 1078833430039.

It is an arithmetic number, because the mean of its divisors is an integer number (1078833430039).

Almost surely, 2^{2157666860077} is an apocalyptic number.

It is an amenable number.

2157666860077 is a deficient number, since it is larger than the sum of its proper divisors (1).

2157666860077 is an equidigital number, since it uses as much as digits as its factorization.

2157666860077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 35562240, while the sum is 61.

The spelling of 2157666860077 in words is "two trillion, one hundred fifty-seven billion, six hundred sixty-six million, eight hundred sixty thousand, seventy-seven".