61639006513 has 8 divisors (see below), whose sum is σ = 70446168128. Its totient is φ = 52832242224.

The previous prime is 61639006511. The next prime is 61639006547. The reversal of 61639006513 is 31560093616.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61639006513 - 2¹ = 61639006511 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61639006511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 401395 + ... + 533287.

It is an arithmetic number, because the mean of its divisors is an integer number (8805771016).

Almost surely, 2^61639006513 is an apocalyptic number.

It is an amenable number.

61639006513 is a deficient number, since it is larger than the sum of its proper divisors (8807161615).

61639006513 is a wasteful number, since it uses less digits than its factorization.

61639006513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198663.

The product of its (nonzero) digits is 87480, while the sum is 40.

The spelling of 61639006513 in words is "sixty-one billion, six hundred thirty-nine million, six thousand, five hundred thirteen".