77651872081 has 8 divisors (see below), whose sum is σ = 88853097024. Its totient is φ = 66477672240.

The previous prime is 77651872057. The next prime is 77651872087. The reversal of 77651872081 is 18027815677.

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

It is not a de Polignac number, because 77651872081 - 2¹⁵ = 77651839313 is a prime.

It is a super-2 number, since 2×77651872081² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77651872087) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6750115 + ... + 6761608.

It is an arithmetic number, because the mean of its divisors is an integer number (11106637128).

Almost surely, 2^77651872081 is an apocalyptic number.

It is an amenable number.

77651872081 is a deficient number, since it is larger than the sum of its proper divisors (11201224943).

77651872081 is a wasteful number, since it uses less digits than its factorization.

77651872081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13512551.

The product of its (nonzero) digits is 1317120, while the sum is 52.

The spelling of 77651872081 in words is "seventy-seven billion, six hundred fifty-one million, eight hundred seventy-two thousand, eighty-one".