661012523 has 8 divisors (see below), whose sum is σ = 668930400. Its totient is φ = 653105728.

The previous prime is 661012519. The next prime is 661012567. The reversal of 661012523 is 325210166.

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 661012523 - 2² = 661012519 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 661012492 and 661012501.

It is not an unprimeable number, because it can be changed into a prime (661017523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 235613 + ... + 238401.

It is an arithmetic number, because the mean of its divisors is an integer number (83616300).

Almost surely, 2^661012523 is an apocalyptic number.

661012523 is a deficient number, since it is larger than the sum of its proper divisors (7917877).

661012523 is a wasteful number, since it uses less digits than its factorization.

661012523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5541.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 661012523 is about 25710.1638073350. The cubic root of 661012523 is about 871.1037749778.

Adding to 661012523 its reverse (325210166), we get a palindrome (986222689).

The spelling of 661012523 in words is "six hundred sixty-one million, twelve thousand, five hundred twenty-three".