18783721074677 has 16 divisors (see below), whose sum is σ = 20271173756400. Its totient is φ = 17302359360000.

The previous prime is 18783721074653. The next prime is 18783721074691. The reversal of 18783721074677 is 77647012738781.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 2883971547076 + 15899749527601 = 1698226^2 + 3987449^2 .

It is not a de Polignac number, because 18783721074677 - 2⁸ = 18783721074421 is a prime.

It is a super-2 number, since 2×18783721074677² (a number of 27 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 (18783721074607) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37006199 + ... + 37510347.

It is an arithmetic number, because the mean of its divisors is an integer number (1266948359775).

Almost surely, 2^{18783721074677} is an apocalyptic number.

It is an amenable number.

18783721074677 is a deficient number, since it is larger than the sum of its proper divisors (1487452681723).

18783721074677 is a wasteful number, since it uses less digits than its factorization.

18783721074677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510184.

The product of its (nonzero) digits is 154893312, while the sum is 68.

The spelling of 18783721074677 in words is "eighteen trillion, seven hundred eighty-three billion, seven hundred twenty-one million, seventy-four thousand, six hundred seventy-seven".