77451645728651 has 16 divisors (see below), whose sum is σ = 79455814478304. Its totient is φ = 75456825986304.

The previous prime is 77451645728621. The next prime is 77451645728657. The reversal of 77451645728651 is 15682754615477.

It is a cyclic number.

It is not a de Polignac number, because 77451645728651 - 2¹⁴ = 77451645712267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77451645728657) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52188365 + ... + 53651921.

It is an arithmetic number, because the mean of its divisors is an integer number (4965988404894).

Almost surely, 2^{77451645728651} is an apocalyptic number.

77451645728651 is a deficient number, since it is larger than the sum of its proper divisors (2004168749653).

77451645728651 is a wasteful number, since it uses less digits than its factorization.

77451645728651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1466750.

The product of its digits is 395136000, while the sum is 68.

The spelling of 77451645728651 in words is "seventy-seven trillion, four hundred fifty-one billion, six hundred forty-five million, seven hundred twenty-eight thousand, six hundred fifty-one".