2061637521 has 32 divisors (see below), whose sum is σ = 2943388800. Its totient is φ = 1281047040.

The previous prime is 2061637517. The next prime is 2061637559. The reversal of 2061637521 is 1257361602.

It is not a de Polignac number, because 2061637521 - 2² = 2061637517 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2061637561) 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, 419245 + ... + 424133.

It is an arithmetic number, because the mean of its divisors is an integer number (91980900).

Almost surely, 2^2061637521 is an apocalyptic number.

It is an amenable number.

2061637521 is a deficient number, since it is larger than the sum of its proper divisors (881751279).

2061637521 is a wasteful number, since it uses less digits than its factorization.

2061637521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5089.

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 2061637521 is about 45405.2587372872. The cubic root of 2061637521 is about 1272.7333859402.

The spelling of 2061637521 in words is "two billion, sixty-one million, six hundred thirty-seven thousand, five hundred twenty-one".