61002664139 has 4 divisors (see below), whose sum is σ = 62153657856. Its totient is φ = 59851670424.

The previous prime is 61002664123. The next prime is 61002664171. The reversal of 61002664139 is 93146620016.

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

It is a cyclic number.

It is not a de Polignac number, because 61002664139 - 2⁴ = 61002664123 is a prime.

It is a super-2 number, since 2×61002664139² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61002660139) 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, 575496779 + ... + 575496884.

It is an arithmetic number, because the mean of its divisors is an integer number (15538414464).

Almost surely, 2^61002664139 is an apocalyptic number.

61002664139 is a deficient number, since it is larger than the sum of its proper divisors (1150993717).

61002664139 is a wasteful number, since it uses less digits than its factorization.

61002664139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1150993716.

The product of its (nonzero) digits is 46656, while the sum is 38.

The spelling of 61002664139 in words is "sixty-one billion, two million, six hundred sixty-four thousand, one hundred thirty-nine".