54155517949 has 4 divisors (see below), whose sum is σ = 58321327036. Its totient is φ = 49989708864.

The previous prime is 54155517929. The next prime is 54155517989. The reversal of 54155517949 is 94971555145.

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

It can be written as a sum of positive squares in 2 ways, for example, as 18039176100 + 36116341849 = 134310^2 + 190043^2 .

It is a cyclic number.

It is not a de Polignac number, because 54155517949 - 2²³ = 54147129341 is a prime.

It is a super-2 number, since 2×54155517949² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 54155517949.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (54155517929) 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, 2082904524 + ... + 2082904549.

It is an arithmetic number, because the mean of its divisors is an integer number (14580331759).

Almost surely, 2^54155517949 is an apocalyptic number.

It is an amenable number.

54155517949 is a deficient number, since it is larger than the sum of its proper divisors (4165809087).

54155517949 is a wasteful number, since it uses less digits than its factorization.

54155517949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4165809086.

The product of its digits is 5670000, while the sum is 55.

It can be divided in two parts, 541555 and 17949, that added together give a square (559504 = 748²).

The spelling of 54155517949 in words is "fifty-four billion, one hundred fifty-five million, five hundred seventeen thousand, nine hundred forty-nine".