80642357597 has 4 divisors (see below), whose sum is σ = 80643322236. Its totient is φ = 80641392960.

The previous prime is 80642357591. The next prime is 80642357629. The reversal of 80642357597 is 79575324608.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20089944121 + 60552413476 = 141739^2 + 246074^2 .

It is a cyclic number.

It is not a de Polignac number, because 80642357597 - 2¹⁶ = 80642292061 is a prime.

It is a super-2 number, since 2×80642357597² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80642357591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 343628 + ... + 528549.

It is an arithmetic number, because the mean of its divisors is an integer number (20160830559).

Almost surely, 2^80642357597 is an apocalyptic number.

It is an amenable number.

80642357597 is a deficient number, since it is larger than the sum of its proper divisors (964639).

80642357597 is an equidigital number, since it uses as much as digits as its factorization.

80642357597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 964638.

The product of its (nonzero) digits is 12700800, while the sum is 56.

The spelling of 80642357597 in words is "eighty billion, six hundred forty-two million, three hundred fifty-seven thousand, five hundred ninety-seven".