61199502187 has 4 divisors (see below), whose sum is σ = 61420439296. Its totient is φ = 60978565080.

The previous prime is 61199502157. The next prime is 61199502193. The reversal of 61199502187 is 78120599116.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61199502187 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61199502187.

It is not an unprimeable number, because it can be changed into a prime (61199502107) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110468139 + ... + 110468692.

It is an arithmetic number, because the mean of its divisors is an integer number (15355109824).

Almost surely, 2^61199502187 is an apocalyptic number.

61199502187 is a deficient number, since it is larger than the sum of its proper divisors (220937109).

61199502187 is a wasteful number, since it uses less digits than its factorization.

61199502187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220937108.

The product of its (nonzero) digits is 272160, while the sum is 49.

The spelling of 61199502187 in words is "sixty-one billion, one hundred ninety-nine million, five hundred two thousand, one hundred eighty-seven".