80661777502 has 8 divisors (see below), whose sum is σ = 120994462512. Its totient is φ = 40330290000.

The previous prime is 80661777499. The next prime is 80661777593. The reversal of 80661777502 is 20577716608.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105999 + ... + 415402.

It is an arithmetic number, because the mean of its divisors is an integer number (15124307814).

Almost surely, 2^80661777502 is an apocalyptic number.

80661777502 is a deficient number, since it is larger than the sum of its proper divisors (40332685010).

80661777502 is a wasteful number, since it uses less digits than its factorization.

80661777502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 598754.

The product of its (nonzero) digits is 987840, while the sum is 49.

The spelling of 80661777502 in words is "eighty billion, six hundred sixty-one million, seven hundred seventy-seven thousand, five hundred two".