661012413 has 16 divisors (see below), whose sum is σ = 933113280. Its totient is φ = 415062144.

The previous prime is 661012403. The next prime is 661012427. The reversal of 661012413 is 314210166.

It is not a de Polignac number, because 661012413 - 2⁵ = 661012381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661012403) 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, 23656 + ... + 43377.

It is an arithmetic number, because the mean of its divisors is an integer number (58319580).

Almost surely, 2^661012413 is an apocalyptic number.

It is an amenable number.

661012413 is a deficient number, since it is larger than the sum of its proper divisors (272100867).

661012413 is a wasteful number, since it uses less digits than its factorization.

661012413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67228.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 661012413 is about 25710.1616681031. The cubic root of 661012413 is about 871.1037266573.

Adding to 661012413 its reverse (314210166), we get a palindrome (975222579).

The spelling of 661012413 in words is "six hundred sixty-one million, twelve thousand, four hundred thirteen".