2001501671556 has 48 divisors (see below), whose sum is σ = 4776170434560. Its totient is φ = 652063877280.

The previous prime is 2001501671501. The next prime is 2001501671573. The reversal of 2001501671556 is 6551761051002.

It is a happy number.

It is a super-2 number, since 2×2001501671556² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2062330 + ... + 2873361.

It is an arithmetic number, because the mean of its divisors is an integer number (99503550720).

Almost surely, 2^{2001501671556} is an apocalyptic number.

It is an amenable number.

2001501671556 is an abundant number, since it is smaller than the sum of its proper divisors (2774668763004).

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

2001501671556 is a wasteful number, since it uses less digits than its factorization.

2001501671556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4936464 (or 4936462 counting only the distinct ones).

The product of its (nonzero) digits is 63000, while the sum is 39.

The spelling of 2001501671556 in words is "two trillion, one billion, five hundred one million, six hundred seventy-one thousand, five hundred fifty-six".