61661374774 has 32 divisors (see below), whose sum is σ = 97475970240. Its totient is φ = 29196554112.

The previous prime is 61661374741. The next prime is 61661374829. The reversal of 61661374774 is 47747316616.

It is a super-3 number, since 3×61661374774³ (a number of 33 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7481784 + ... + 7490020.

It is an arithmetic number, because the mean of its divisors is an integer number (3046124070).

Almost surely, 2^61661374774 is an apocalyptic number.

61661374774 is a deficient number, since it is larger than the sum of its proper divisors (35814595466).

61661374774 is a wasteful number, since it uses less digits than its factorization.

61661374774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9864.

The product of its digits is 3556224, while the sum is 52.

The spelling of 61661374774 in words is "sixty-one billion, six hundred sixty-one million, three hundred seventy-four thousand, seven hundred seventy-four".