73661661778 has 32 divisors (see below), whose sum is σ = 116042595840. Its totient is φ = 35022720000.

The previous prime is 73661661739. The next prime is 73661661779. The reversal of 73661661778 is 87716616637.

It is a super-2 number, since 2×73661661778² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (73661661779) 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, 13535538 + ... + 13540978.

It is an arithmetic number, because the mean of its divisors is an integer number (3626331120).

Almost surely, 2^73661661778 is an apocalyptic number.

73661661778 is a deficient number, since it is larger than the sum of its proper divisors (42380934062).

73661661778 is a wasteful number, since it uses less digits than its factorization.

73661661778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9234.

The product of its digits is 10668672, while the sum is 58.

The spelling of 73661661778 in words is "seventy-three billion, six hundred sixty-one million, six hundred sixty-one thousand, seven hundred seventy-eight".