661003223513006 has 64 divisors (see below), whose sum is σ = 1178176974276096. Its totient is φ = 275041313078400.

The previous prime is 661003223512967. The next prime is 661003223513011. The reversal of 661003223513006 is 600315322300166.

It is a super-2 number, since 2×661003223513006² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 288253280 + ... + 290537363.

It is an arithmetic number, because the mean of its divisors is an integer number (18409015223064).

Almost surely, 2^{661003223513006} is an apocalyptic number.

661003223513006 is a deficient number, since it is larger than the sum of its proper divisors (517173750763090).

661003223513006 is a wasteful number, since it uses less digits than its factorization.

661003223513006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 578790777.

The product of its (nonzero) digits is 116640, while the sum is 38.

The spelling of 661003223513006 in words is "six hundred sixty-one trillion, three billion, two hundred twenty-three million, five hundred thirteen thousand, six".