61000100015 has 4 divisors (see below), whose sum is σ = 73200120024. Its totient is φ = 48800080008.

The previous prime is 61000099981. The next prime is 61000100017. The reversal of 61000100015 is 51000100016.

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 61000100015 - 2⁸ = 61000099759 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61000100017) 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, 6100009997 + ... + 6100010006.

It is an arithmetic number, because the mean of its divisors is an integer number (18300030006).

Almost surely, 2^61000100015 is an apocalyptic number.

61000100015 is a deficient number, since it is larger than the sum of its proper divisors (12200020009).

61000100015 is a wasteful number, since it uses less digits than its factorization.

61000100015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12200020008.

The product of its (nonzero) digits is 30, while the sum is 14.

Subtracting from 61000100015 its reverse (51000100016), we obtain a palindrome (9999999999).

The spelling of 61000100015 in words is "sixty-one billion, one hundred thousand, fifteen".