70351633721 has 2 divisors, whose sum is σ = 70351633722. Its totient is φ = 70351633720.

The previous prime is 70351633567. The next prime is 70351633727. The reversal of 70351633721 is 12733615307.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51103123600 + 19248510121 = 226060^2 + 138739^2 .

It is a cyclic number.

It is not a de Polignac number, because 70351633721 - 2²⁶ = 70284524857 is a prime.

It is not a weakly prime, because it can be changed into another prime (70351633727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35175816860 + 35175816861.

It is an arithmetic number, because the mean of its divisors is an integer number (35175816861).

Almost surely, 2^70351633721 is an apocalyptic number.

It is an amenable number.

70351633721 is a deficient number, since it is larger than the sum of its proper divisors (1).

70351633721 is an equidigital number, since it uses as much as digits as its factorization.

70351633721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 79380, while the sum is 38.

The spelling of 70351633721 in words is "seventy billion, three hundred fifty-one million, six hundred thirty-three thousand, seven hundred twenty-one".