661901053 has 8 divisors (see below), whose sum is σ = 722678976. Its totient is φ = 601224000.

The previous prime is 661901011. The next prime is 661901077. The reversal of 661901053 is 350109166.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 661901053 - 2⁹ = 661900541 is a prime.

It is a super-3 number, since 3×661901053³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661901753) 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, 11148 + ... + 38053.

It is an arithmetic number, because the mean of its divisors is an integer number (90334872).

Almost surely, 2^661901053 is an apocalyptic number.

It is an amenable number.

661901053 is a deficient number, since it is larger than the sum of its proper divisors (60777923).

661901053 is a wasteful number, since it uses less digits than its factorization.

661901053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50435.

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 661901053 is about 25727.4377464994. The cubic root of 661901053 is about 871.4939114557.

The spelling of 661901053 in words is "six hundred sixty-one million, nine hundred one thousand, fifty-three".