54891520231642 has 4 divisors (see below), whose sum is σ = 82337280347466. Its totient is φ = 27445760115820.

The previous prime is 54891520231637. The next prime is 54891520231649. The reversal of 54891520231642 is 24613202519845.

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

It can be written as a sum of positive squares in only one way, i.e., 50261875172721 + 4629645058921 = 7089561^2 + 2151661^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 54891520231642.

It is not an unprimeable number, because it can be changed into a prime (54891520231649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13722880057909 + ... + 13722880057912.

Almost surely, 2^{54891520231642} is an apocalyptic number.

54891520231642 is a deficient number, since it is larger than the sum of its proper divisors (27445760115824).

54891520231642 is a wasteful number, since it uses less digits than its factorization.

54891520231642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27445760115823.

The product of its (nonzero) digits is 4147200, while the sum is 52.

The spelling of 54891520231642 in words is "fifty-four trillion, eight hundred ninety-one billion, five hundred twenty million, two hundred thirty-one thousand, six hundred forty-two".