73661549979 has 32 divisors (see below), whose sum is σ = 99472426560. Its totient is φ = 48484380672.

The previous prime is 73661549947. The next prime is 73661549989. The reversal of 73661549979 is 97994516637.

It is a happy number.

It is not a de Polignac number, because 73661549979 - 2⁵ = 73661549947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (73661549989) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 61744207 + ... + 61745399.

It is an arithmetic number, because the mean of its divisors is an integer number (3108513330).

Almost surely, 2^73661549979 is an apocalyptic number.

73661549979 is a deficient number, since it is larger than the sum of its proper divisors (25810876581).

73661549979 is a wasteful number, since it uses less digits than its factorization.

73661549979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2079.

The product of its digits is 77157360, while the sum is 66.

The spelling of 73661549979 in words is "seventy-three billion, six hundred sixty-one million, five hundred forty-nine thousand, nine hundred seventy-nine".