61720121402 has 8 divisors (see below), whose sum is σ = 92877868512. Its totient is φ = 30760831900.

The previous prime is 61720121399. The next prime is 61720121453. The reversal of 61720121402 is 20412102716.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49613624 + ... + 49614867.

It is an arithmetic number, because the mean of its divisors is an integer number (11609733564).

Almost surely, 2^61720121402 is an apocalyptic number.

61720121402 is a deficient number, since it is larger than the sum of its proper divisors (31157747110).

61720121402 is a wasteful number, since it uses less digits than its factorization.

61720121402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99228804.

The product of its (nonzero) digits is 1344, while the sum is 26.

The spelling of 61720121402 in words is "sixty-one billion, seven hundred twenty million, one hundred twenty-one thousand, four hundred two".