61666621061262 has 64 divisors (see below), whose sum is σ = 143831615155200. Its totient is φ = 17618696322528.

The previous prime is 61666621061249. The next prime is 61666621061273. The reversal of 61666621061262 is 26216012666616.

It is a super-2 number, since 2×61666621061262² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 118934503 + ... + 119451869.

It is an arithmetic number, because the mean of its divisors is an integer number (2247368986800).

Almost surely, 2^{61666621061262} is an apocalyptic number.

61666621061262 is an abundant number, since it is smaller than the sum of its proper divisors (82164994093938).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61666621061262 is a wasteful number, since it uses less digits than its factorization.

61666621061262 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 575310 (or 575296 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 51.

The spelling of 61666621061262 in words is "sixty-one trillion, six hundred sixty-six billion, six hundred twenty-one million, sixty-one thousand, two hundred sixty-two".