1650640520 has 16 divisors (see below), whose sum is σ = 3713941260. Its totient is φ = 660256192.

The previous prime is 1650640499. The next prime is 1650640543. The reversal of 1650640520 is 250460561.

It can be written as a sum of positive squares in 2 ways, for example, as 1481172196 + 169468324 = 38486^2 + 13018^2 .

It is a super-2 number, since 2×1650640520² = 5449228252531740800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20632967 + ... + 20633046.

Almost surely, 2^1650640520 is an apocalyptic number.

1650640520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1650640520 is an abundant number, since it is smaller than the sum of its proper divisors (2063300740).

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

1650640520 is a wasteful number, since it uses less digits than its factorization.

1650640520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41266024 (or 41266020 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 1650640520 is about 40628.0755143534. The cubic root of 1650640520 is about 1181.8186358471.

The spelling of 1650640520 in words is "one billion, six hundred fifty million, six hundred forty thousand, five hundred twenty".