61312217187 has 64 divisors (see below), whose sum is σ = 96277870080. Its totient is φ = 34355902464.

The previous prime is 61312217177. The next prime is 61312217189. The reversal of 61312217187 is 78171221316.

It is a happy number.

61312217187 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 61312217187 - 2¹⁵ = 61312184419 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (61312217189) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4384068 + ... + 4398030.

It is an arithmetic number, because the mean of its divisors is an integer number (1504341720).

Almost surely, 2^61312217187 is an apocalyptic number.

61312217187 is a deficient number, since it is larger than the sum of its proper divisors (34965652893).

61312217187 is a wasteful number, since it uses less digits than its factorization.

61312217187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14212.

The product of its digits is 28224, while the sum is 39.

The spelling of 61312217187 in words is "sixty-one billion, three hundred twelve million, two hundred seventeen thousand, one hundred eighty-seven".