77021641501 has 4 divisors (see below), whose sum is σ = 88024733152. Its totient is φ = 66018549852.

The previous prime is 77021641493. The next prime is 77021641547. The reversal of 77021641501 is 10514612077.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 77021641501 - 2³ = 77021641493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77021641561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5501545815 + ... + 5501545828.

It is an arithmetic number, because the mean of its divisors is an integer number (22006183288).

Almost surely, 2^77021641501 is an apocalyptic number.

It is an amenable number.

77021641501 is a deficient number, since it is larger than the sum of its proper divisors (11003091651).

77021641501 is a wasteful number, since it uses less digits than its factorization.

77021641501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11003091650.

The product of its (nonzero) digits is 11760, while the sum is 34.

The spelling of 77021641501 in words is "seventy-seven billion, twenty-one million, six hundred forty-one thousand, five hundred one".