69878999987957 has 2 divisors, whose sum is σ = 69878999987958. Its totient is φ = 69878999987956.

The previous prime is 69878999987899. The next prime is 69878999987999. The reversal of 69878999987957 is 75978999987896.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67498564494001 + 2380435493956 = 8215751^2 + 1542866^2 .

It is a cyclic number.

It is not a de Polignac number, because 69878999987957 - 2³⁶ = 69810280511221 is a prime.

It is a super-2 number, since 2×69878999987957² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (69878999987857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34939499993978 + 34939499993979.

It is an arithmetic number, because the mean of its divisors is an integer number (34939499993979).

Almost surely, 2^{69878999987957} is an apocalyptic number.

It is an amenable number.

69878999987957 is a deficient number, since it is larger than the sum of its proper divisors (1).

69878999987957 is an equidigital number, since it uses as much as digits as its factorization.

69878999987957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2799886279680, while the sum is 110.

The spelling of 69878999987957 in words is "sixty-nine trillion, eight hundred seventy-eight billion, nine hundred ninety-nine million, nine hundred eighty-seven thousand, nine hundred fifty-seven".