755661021 has 8 divisors (see below), whose sum is σ = 1051354560. Its totient is φ = 481870752.

The previous prime is 755661017. The next prime is 755661031. The reversal of 755661021 is 120166557.

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

It is not a de Polignac number, because 755661021 - 2² = 755661017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (755661031) 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, 5475736 + ... + 5475873.

It is an arithmetic number, because the mean of its divisors is an integer number (131419320).

Almost surely, 2^755661021 is an apocalyptic number.

It is an amenable number.

755661021 is a deficient number, since it is larger than the sum of its proper divisors (295693539).

755661021 is a wasteful number, since it uses less digits than its factorization.

755661021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10951635.

The product of its (nonzero) digits is 12600, while the sum is 33.

The square root of 755661021 is about 27489.2892050704. The cubic root of 755661021 is about 910.8405151370.

The spelling of 755661021 in words is "seven hundred fifty-five million, six hundred sixty-one thousand, twenty-one".