61690109052 has 192 divisors, whose sum is σ = 171477734400. Its totient is φ = 17157761280.

The previous prime is 61690108957. The next prime is 61690109069. The reversal of 61690109052 is 25090109616.

61690109052 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an alternating number because its digits alternate between even and odd.

It is a self number, because there is not a number n which added to its sum of digits gives 61690109052.

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, 41318818 + ... + 41320310.

It is an arithmetic number, because the mean of its divisors is an integer number (893113200).

Almost surely, 2^61690109052 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 61690109052, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85738867200).

61690109052 is an abundant number, since it is smaller than the sum of its proper divisors (109787625348).

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

61690109052 is a wasteful number, since it uses less digits than its factorization.

61690109052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1745 (or 1721 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 39.

The spelling of 61690109052 in words is "sixty-one billion, six hundred ninety million, one hundred nine thousand, fifty-two".