1651020165 has 80 divisors (see below), whose sum is σ = 3086138880. Its totient is φ = 843488640.

The previous prime is 1651020113. The next prime is 1651020191. The reversal of 1651020165 is 5610201561.

It is a happy number.

1651020165 is a `hidden beast` number, since 1 + 651 + 0 + 2 + 0 + 1 + 6 + 5 = 666.

It is not a de Polignac number, because 1651020165 - 2⁷ = 1651020037 is a prime.

It is a super-4 number, since 4×1651020165⁴ (a number of 38 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

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, 1342771 + ... + 1343999.

It is an arithmetic number, because the mean of its divisors is an integer number (38576736).

Almost surely, 2^1651020165 is an apocalyptic number.

1651020165 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1651020165 is a deficient number, since it is larger than the sum of its proper divisors (1435118715).

1651020165 is a wasteful number, since it uses less digits than its factorization.

1651020165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1384 (or 1375 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 1651020165 is about 40632.7474458718. The cubic root of 1651020165 is about 1181.9092344434.

The spelling of 1651020165 in words is "one billion, six hundred fifty-one million, twenty thousand, one hundred sixty-five".