661148867 has 16 divisors (see below), whose sum is σ = 689472000. Its totient is φ = 633613344.

The previous prime is 661148861. The next prime is 661148897. The reversal of 661148867 is 768841166.

It is a cyclic number.

It is not a de Polignac number, because 661148867 - 2¹⁶ = 661083331 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (661148861) 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, 386009 + ... + 387717.

It is an arithmetic number, because the mean of its divisors is an integer number (43092000).

Almost surely, 2^661148867 is an apocalyptic number.

661148867 is a deficient number, since it is larger than the sum of its proper divisors (28323133).

661148867 is a wasteful number, since it uses less digits than its factorization.

661148867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1930.

The product of its digits is 387072, while the sum is 47.

The square root of 661148867 is about 25712.8152289865. The cubic root of 661148867 is about 871.1636637111.

The spelling of 661148867 in words is "six hundred sixty-one million, one hundred forty-eight thousand, eight hundred sixty-seven".