54587451781 has 4 divisors (see below), whose sum is σ = 54591630912. Its totient is φ = 54583272652.

The previous prime is 54587451769. The next prime is 54587451791. The reversal of 54587451781 is 18715478545.

54587451781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18715478545 = 5 ⋅3743095709.

It is a cyclic number.

It is not a de Polignac number, because 54587451781 - 2¹⁷ = 54587320709 is a prime.

It is a super-2 number, since 2×54587451781² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (54587451731) 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, 2069911 + ... + 2096116.

It is an arithmetic number, because the mean of its divisors is an integer number (13647907728).

Almost surely, 2^54587451781 is an apocalyptic number.

It is an amenable number.

54587451781 is a deficient number, since it is larger than the sum of its proper divisors (4179131).

54587451781 is a wasteful number, since it uses less digits than its factorization.

54587451781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4179130.

The product of its digits is 6272000, while the sum is 55.

The spelling of 54587451781 in words is "fifty-four billion, five hundred eighty-seven million, four hundred fifty-one thousand, seven hundred eighty-one".