16177939451 has 4 divisors (see below), whose sum is σ = 16301435304. Its totient is φ = 16054443600.

The previous prime is 16177939399. The next prime is 16177939471. The reversal of 16177939451 is 15493977161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15493977161 = 13 ⋅1191844397.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16177939451 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16177939393 and 16177939402.

It is not an unprimeable number, because it can be changed into a prime (16177939471) 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, 61747730 + ... + 61747991.

It is an arithmetic number, because the mean of its divisors is an integer number (4075358826).

Almost surely, 2^16177939451 is an apocalyptic number.

16177939451 is a deficient number, since it is larger than the sum of its proper divisors (123495853).

16177939451 is a wasteful number, since it uses less digits than its factorization.

16177939451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123495852.

The product of its digits is 1428840, while the sum is 53.

The spelling of 16177939451 in words is "sixteen billion, one hundred seventy-seven million, nine hundred thirty-nine thousand, four hundred fifty-one".