381609857916 has 108 divisors (see below), whose sum is σ = 1181173473480. Its totient is φ = 103292884800.

The previous prime is 381609857911. The next prime is 381609857969. The reversal of 381609857916 is 619758906183.

381609857916 is a `hidden beast` number, since 3 + 8 + 1 + 609 + 8 + 5 + 7 + 9 + 16 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381609857911) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 5659435 + ... + 5726466.

Almost surely, 2^381609857916 is an apocalyptic number.

381609857916 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

381609857916 is an abundant number, since it is smaller than the sum of its proper divisors (799563615564).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

381609857916 is a wasteful number, since it uses less digits than its factorization.

381609857916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11385944 (or 11385932 counting only the distinct ones).

The product of its (nonzero) digits is 19595520, while the sum is 63.

It can be divided in two parts, 381609 and 857916, that added together give a triangular number (1239525 = T₁₅₇₄).

The spelling of 381609857916 in words is "three hundred eighty-one billion, six hundred nine million, eight hundred fifty-seven thousand, nine hundred sixteen".