61512987854 has 4 divisors (see below), whose sum is σ = 92269481784. Its totient is φ = 30756493926.

The previous prime is 61512987853. The next prime is 61512987869. The reversal of 61512987854 is 45878921516.

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

It is a self number, because there is not a number n which added to its sum of digits gives 61512987854.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61512987853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15378246962 + ... + 15378246965.

It is an arithmetic number, because the mean of its divisors is an integer number (23067370446).

Almost surely, 2^61512987854 is an apocalyptic number.

61512987854 is a deficient number, since it is larger than the sum of its proper divisors (30756493930).

61512987854 is a wasteful number, since it uses less digits than its factorization.

61512987854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30756493929.

The product of its digits is 4838400, while the sum is 56.

The spelling of 61512987854 in words is "sixty-one billion, five hundred twelve million, nine hundred eighty-seven thousand, eight hundred fifty-four".