70121165557 has 2 divisors, whose sum is σ = 70121165558. Its totient is φ = 70121165556.

The previous prime is 70121165473. The next prime is 70121165561. The reversal of 70121165557 is 75556112107.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69477579396 + 643586161 = 263586^2 + 25369^2 .

It is a cyclic number.

It is not a de Polignac number, because 70121165557 - 2¹¹ = 70121163509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70121115557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35060582778 + 35060582779.

It is an arithmetic number, because the mean of its divisors is an integer number (35060582779).

Almost surely, 2^70121165557 is an apocalyptic number.

It is an amenable number.

70121165557 is a deficient number, since it is larger than the sum of its proper divisors (1).

70121165557 is an equidigital number, since it uses as much as digits as its factorization.

70121165557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 73500, while the sum is 40.

The spelling of 70121165557 in words is "seventy billion, one hundred twenty-one million, one hundred sixty-five thousand, five hundred fifty-seven".