651059661 has 16 divisors (see below), whose sum is σ = 996249600. Its totient is φ = 370474608.

The previous prime is 651059641. The next prime is 651059671. The reversal of 651059661 is 166950156.

It is not a de Polignac number, because 651059661 - 2¹⁰ = 651058637 is a prime.

It is a super-3 number, since 3×651059661³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651059641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59841 + ... + 69878.

It is an arithmetic number, because the mean of its divisors is an integer number (62265600).

Almost surely, 2^651059661 is an apocalyptic number.

It is an amenable number.

651059661 is a deficient number, since it is larger than the sum of its proper divisors (345189939).

651059661 is a wasteful number, since it uses less digits than its factorization.

651059661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129968.

The product of its (nonzero) digits is 48600, while the sum is 39.

The square root of 651059661 is about 25515.8707670344. The cubic root of 651059661 is about 866.7095778720.

The spelling of 651059661 in words is "six hundred fifty-one million, fifty-nine thousand, six hundred sixty-one".