661012535 has 8 divisors (see below), whose sum is σ = 818802816. Its totient is φ = 511751520.

The previous prime is 661012519. The next prime is 661012567. The reversal of 661012535 is 535210166.

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

It is not a de Polignac number, because 661012535 - 2⁴ = 661012519 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 661012498 and 661012507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2132144 + ... + 2132453.

It is an arithmetic number, because the mean of its divisors is an integer number (102350352).

Almost surely, 2^661012535 is an apocalyptic number.

661012535 is a deficient number, since it is larger than the sum of its proper divisors (157790281).

661012535 is a wasteful number, since it uses less digits than its factorization.

661012535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4264633.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 661012535 is about 25710.1640407058. The cubic root of 661012535 is about 871.1037802491.

The spelling of 661012535 in words is "six hundred sixty-one million, twelve thousand, five hundred thirty-five".