61881197250 has 64 divisors (see below), whose sum is σ = 154494677376. Its totient is φ = 16497464000.

The previous prime is 61881197141. The next prime is 61881197291. The reversal of 61881197250 is 5279118816.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 61881197250.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3937909 + ... + 3953591.

It is an arithmetic number, because the mean of its divisors is an integer number (2413979334).

Almost surely, 2^61881197250 is an apocalyptic number.

61881197250 is an abundant number, since it is smaller than the sum of its proper divisors (92613480126).

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

61881197250 is a wasteful number, since it uses less digits than its factorization.

61881197250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20964 (or 20954 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 48.

The spelling of 61881197250 in words is "sixty-one billion, eight hundred eighty-one million, one hundred ninety-seven thousand, two hundred fifty".