661714551936 has 192 divisors, whose sum is σ = 2090835845280. Its totient is φ = 207596556288.

The previous prime is 661714551881. The next prime is 661714551989. The reversal of 661714551936 is 639155417166.

661714551936 is a `hidden beast` number, since 6 + 6 + 171 + 455 + 19 + 3 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (192).

It is a super-2 number, since 2×661714551936² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 96946 + ... + 1154481.

Almost surely, 2^661714551936 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 661714551936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1045417922640).

661714551936 is an abundant number, since it is smaller than the sum of its proper divisors (1429121293344).

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

661714551936 is a wasteful number, since it uses less digits than its factorization.

661714551936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1251473 (or 1251449 counting only the distinct ones).

The product of its digits is 4082400, while the sum is 54.

The spelling of 661714551936 in words is "six hundred sixty-one billion, seven hundred fourteen million, five hundred fifty-one thousand, nine hundred thirty-six".