61614731640 has 256 divisors, whose sum is σ = 231928427520. Its totient is φ = 12721213440.

The previous prime is 61614731623. The next prime is 61614731669. The reversal of 61614731640 is 4613741616.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1429444 + ... + 1471916.

It is an arithmetic number, because the mean of its divisors is an integer number (905970420).

Almost surely, 2^61614731640 is an apocalyptic number.

61614731640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61614731640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (115964213760).

61614731640 is an abundant number, since it is smaller than the sum of its proper divisors (170313695880).

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

61614731640 is a wasteful number, since it uses less digits than its factorization.

61614731640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42662 (or 42658 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 39.

The spelling of 61614731640 in words is "sixty-one billion, six hundred fourteen million, seven hundred thirty-one thousand, six hundred forty".