661015002 has 16 divisors (see below), whose sum is σ = 1323842400. Its totient is φ = 220036272.

The previous prime is 661015001. The next prime is 661015007. The reversal of 661015002 is 200510166.

It is a happy number.

It is a super-3 number, since 3×661015002³ (a number of 27 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 661015002.

It is not an unprimeable number, because it can be changed into a prime (661015001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70752 + ... + 79547.

It is an arithmetic number, because the mean of its divisors is an integer number (82740150).

Almost surely, 2^661015002 is an apocalyptic number.

661015002 is an abundant number, since it is smaller than the sum of its proper divisors (662827398).

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

661015002 is a wasteful number, since it uses less digits than its factorization.

661015002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151037.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 661015002 is about 25710.2120177956. The cubic root of 661015002 is about 871.1048639454.

Adding to 661015002 its reverse (200510166), we get a palindrome (861525168).

It can be divided in two parts, 6610 and 15002, that added together give a palindrome (21612).

The spelling of 661015002 in words is "six hundred sixty-one million, fifteen thousand, two".