661101402 has 32 divisors (see below), whose sum is σ = 1430694720. Its totient is φ = 202446720.

The previous prime is 661101401. The next prime is 661101439. The reversal of 661101402 is 204101166.

It is not an unprimeable number, because it can be changed into a prime (661101401) 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, 3627 + ... + 36542.

It is an arithmetic number, because the mean of its divisors is an integer number (44709210).

Almost surely, 2^661101402 is an apocalyptic number.

661101402 is an abundant number, since it is smaller than the sum of its proper divisors (769593318).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

661101402 is a wasteful number, since it uses less digits than its factorization.

661101402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40398.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 661101402 is about 25711.8922290834. The cubic root of 661101402 is about 871.1428157725.

Adding to 661101402 its reverse (204101166), we get a palindrome (865202568).

The spelling of 661101402 in words is "six hundred sixty-one million, one hundred one thousand, four hundred two".