61501368408 has 32 divisors (see below), whose sum is σ = 155190375360. Its totient is φ = 20308862240.

The previous prime is 61501368407. The next prime is 61501368463. The reversal of 61501368408 is 80486310516.

It is a self number, because there is not a number n which added to its sum of digits gives 61501368408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61501368407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11971998 + ... + 11977133.

It is an arithmetic number, because the mean of its divisors is an integer number (4849699230).

Almost surely, 2^61501368408 is an apocalyptic number.

It is an amenable number.

61501368408 is an abundant number, since it is smaller than the sum of its proper divisors (93689006952).

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

61501368408 is a wasteful number, since it uses less digits than its factorization.

61501368408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23949247 (or 23949243 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 42.

The spelling of 61501368408 in words is "sixty-one billion, five hundred one million, three hundred sixty-eight thousand, four hundred eight".