55915255193918 has 4 divisors (see below), whose sum is σ = 83872882790880. Its totient is φ = 27957627596958.

The previous prime is 55915255193899. The next prime is 55915255193923. The reversal of 55915255193918 is 81939155251955.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13978813798478 + ... + 13978813798481.

It is an arithmetic number, because the mean of its divisors is an integer number (20968220697720).

Almost surely, 2^{55915255193918} is an apocalyptic number.

55915255193918 is a deficient number, since it is larger than the sum of its proper divisors (27957627596962).

55915255193918 is a wasteful number, since it uses less digits than its factorization.

55915255193918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27957627596961.

The product of its digits is 109350000, while the sum is 68.

The spelling of 55915255193918 in words is "fifty-five trillion, nine hundred fifteen billion, two hundred fifty-five million, one hundred ninety-three thousand, nine hundred eighteen".