2061660520 has 32 divisors (see below), whose sum is σ = 4651206120. Its totient is φ = 822447360.

The previous prime is 2061660511. The next prime is 2061660521. The reversal of 2061660520 is 250661602.

It can be written as a sum of positive squares in 4 ways, for example, as 1959124644 + 102535876 = 44262^2 + 10126^2 .

It is not an unprimeable number, because it can be changed into a prime (2061660521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54171 + ... + 84010.

Almost surely, 2^2061660520 is an apocalyptic number.

2061660520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2061660520 is an abundant number, since it is smaller than the sum of its proper divisors (2589545600).

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

2061660520 is a wasteful number, since it uses less digits than its factorization.

2061660520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138565 (or 138561 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 2061660520 is about 45405.5120001966. The cubic root of 2061660520 is about 1272.7381186645.

The spelling of 2061660520 in words is "two billion, sixty-one million, six hundred sixty thousand, five hundred twenty".