61660601655510 has 256 divisors, whose sum is σ = 184362546106368. Its totient is φ = 12966862233600.

The previous prime is 61660601655481. The next prime is 61660601655511. The reversal of 61660601655510 is 1555610606616.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 61660601655510.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61660601655511) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 47567187 + ... + 48846273.

It is an arithmetic number, because the mean of its divisors is an integer number (720166195728).

Almost surely, 2^{61660601655510} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61660601655510, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92181273053184).

61660601655510 is an abundant number, since it is smaller than the sum of its proper divisors (122701944450858).

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

61660601655510 is a wasteful number, since it uses less digits than its factorization.

61660601655510 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1279799.

The product of its (nonzero) digits is 972000, while the sum is 48.

The spelling of 61660601655510 in words is "sixty-one trillion, six hundred sixty billion, six hundred one million, six hundred fifty-five thousand, five hundred ten".