609902161920 has 1040 divisors, whose sum is σ = 2350598136480. Its totient is φ = 151353556992.

The previous prime is 609902161909. The next prime is 609902161931. The reversal of 609902161920 is 29161209906.

609902161920 is a `hidden beast` number, since 6 + 0 + 9 + 9 + 0 + 2 + 1 + 619 + 20 = 666.

It is an interprime number because it is at equal distance from previous prime (609902161909) and next prime (609902161931).

It is a super-2 number, since 2×609902161920² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 6852833236 + ... + 6852833324.

Almost surely, 2^609902161920 is an apocalyptic number.

609902161920 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 609902161920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1175299068240).

609902161920 is an abundant number, since it is smaller than the sum of its proper divisors (1740695974560).

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

609902161920 is an frugal number, since it uses more digits than its factorization.

609902161920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162 (or 116 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 45.

The spelling of 609902161920 in words is "six hundred nine billion, nine hundred two million, one hundred sixty-one thousand, nine hundred twenty".