661361542 has 8 divisors (see below), whose sum is σ = 992182032. Its totient is φ = 330634200.

The previous prime is 661361539. The next prime is 661361563. The reversal of 661361542 is 245163166.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 661361498 and 661361507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1434 + ... + 36397.

It is an arithmetic number, because the mean of its divisors is an integer number (124022754).

Almost surely, 2^661361542 is an apocalyptic number.

661361542 is a deficient number, since it is larger than the sum of its proper divisors (330820490).

661361542 is a wasteful number, since it uses less digits than its factorization.

661361542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46574.

The product of its digits is 25920, while the sum is 34.

The square root of 661361542 is about 25716.9504801794. The cubic root of 661361542 is about 871.2570641936.

The spelling of 661361542 in words is "six hundred sixty-one million, three hundred sixty-one thousand, five hundred forty-two".