61512987903 has 4 divisors (see below), whose sum is σ = 82017317208. Its totient is φ = 41008658600.

The previous prime is 61512987869. The next prime is 61512987953. The reversal of 61512987903 is 30978921516.

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 61512987903 - 2⁶ = 61512987839 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61512987953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10252164648 + ... + 10252164653.

It is an arithmetic number, because the mean of its divisors is an integer number (20504329302).

Almost surely, 2^61512987903 is an apocalyptic number.

61512987903 is a deficient number, since it is larger than the sum of its proper divisors (20504329305).

61512987903 is a wasteful number, since it uses less digits than its factorization.

61512987903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20504329304.

The product of its (nonzero) digits is 816480, while the sum is 51.

The spelling of 61512987903 in words is "sixty-one billion, five hundred twelve million, nine hundred eighty-seven thousand, nine hundred three".