661274280102 has 16 divisors (see below), whose sum is σ = 1322582564160. Its totient is φ = 220419092712.

The previous prime is 661274280011. The next prime is 661274280103. The reversal of 661274280102 is 201082472166.

It is a super-3 number, since 3×661274280102³ (a number of 36 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661274280103) 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, 1160452 + ... + 1633767.

It is an arithmetic number, because the mean of its divisors is an integer number (82661410260).

Almost surely, 2^661274280102 is an apocalyptic number.

661274280102 is an abundant number, since it is smaller than the sum of its proper divisors (661308284058).

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

661274280102 is a wasteful number, since it uses less digits than its factorization.

661274280102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2833667.

The product of its (nonzero) digits is 64512, while the sum is 39.

The spelling of 661274280102 in words is "six hundred sixty-one billion, two hundred seventy-four million, two hundred eighty thousand, one hundred two".