1665501696 has 320 divisors, whose sum is σ = 5509468800. Its totient is φ = 493682688.

The previous prime is 1665501661. The next prime is 1665501701. The reversal of 1665501696 is 6961055661.

1665501696 is a `hidden beast` number, since 1 + 6 + 6 + 550 + 1 + 6 + 96 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4464966 + ... + 4465338.

It is an arithmetic number, because the mean of its divisors is an integer number (17217090).

Almost surely, 2^1665501696 is an apocalyptic number.

1665501696 is a gapful number since it is divisible by the number (16) 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 1665501696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2754734400).

1665501696 is an abundant number, since it is smaller than the sum of its proper divisors (3843967104).

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

1665501696 is a wasteful number, since it uses less digits than its factorization.

1665501696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 436 (or 414 counting only the distinct ones).

The product of its (nonzero) digits is 291600, while the sum is 45.

The square root of 1665501696 is about 40810.5586337654. The cubic root of 1665501696 is about 1185.3547920173.

The spelling of 1665501696 in words is "one billion, six hundred sixty-five million, five hundred one thousand, six hundred ninety-six".