661212342 has 32 divisors (see below), whose sum is σ = 1679270400. Its totient is φ = 188917704.

The previous prime is 661212341. The next prime is 661212379. The reversal of 661212342 is 243212166.

661212342 is a `hidden beast` number, since 6 + 612 + 1 + 2 + 3 + 42 = 666.

It is a super-2 number, since 2×661212342² = 874403522426249928, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661212341) 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, 874242 + ... + 874997.

It is an arithmetic number, because the mean of its divisors is an integer number (52477200).

Almost surely, 2^661212342 is an apocalyptic number.

661212342 is an abundant number, since it is smaller than the sum of its proper divisors (1018058058).

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

661212342 is a wasteful number, since it uses less digits than its factorization.

661212342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1749257 (or 1749251 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 661212342 is about 25714.0495060580. The cubic root of 661212342 is about 871.1915421243.

The spelling of 661212342 in words is "six hundred sixty-one million, two hundred twelve thousand, three hundred forty-two".