77536821901 has 24 divisors (see below), whose sum is σ = 98998441472. Its totient is φ = 59427799200.

The previous prime is 77536821899. The next prime is 77536821907. The reversal of 77536821901 is 10912863577.

It is a happy number.

It is not a de Polignac number, because 77536821901 - 2¹ = 77536821899 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77536821907) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 698685 + ... + 802018.

Almost surely, 2^77536821901 is an apocalyptic number.

It is an amenable number.

77536821901 is a deficient number, since it is larger than the sum of its proper divisors (21461619571).

77536821901 is a wasteful number, since it uses less digits than its factorization.

77536821901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1500793 (or 1500782 counting only the distinct ones).

The product of its (nonzero) digits is 635040, while the sum is 49.

The spelling of 77536821901 in words is "seventy-seven billion, five hundred thirty-six million, eight hundred twenty-one thousand, nine hundred one".