1665646151 has 32 divisors (see below), whose sum is σ = 1907017728. Its totient is φ = 1443899520.

The previous prime is 1665646139. The next prime is 1665646159. The reversal of 1665646151 is 1516465661.

It is a cyclic number.

It is not a de Polignac number, because 1665646151 - 2²⁶ = 1598537287 is a prime.

It is a super-2 number, since 2×1665646151² = 5548754200682229602, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1665646099 and 1665646108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665646159) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4799960 + ... + 4800306.

It is an arithmetic number, because the mean of its divisors is an integer number (59594304).

Almost surely, 2^1665646151 is an apocalyptic number.

1665646151 is a deficient number, since it is larger than the sum of its proper divisors (241371577).

1665646151 is a wasteful number, since it uses less digits than its factorization.

1665646151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 711.

The product of its digits is 129600, while the sum is 41.

The square root of 1665646151 is about 40812.3284192412. The cubic root of 1665646151 is about 1185.3890610660.

The spelling of 1665646151 in words is "one billion, six hundred sixty-five million, six hundred forty-six thousand, one hundred fifty-one".