61020739999 has 4 divisors (see below), whose sum is σ = 62319053664. Its totient is φ = 59722426336.

The previous prime is 61020739991. The next prime is 61020740017. The reversal of 61020739999 is 99993702016.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61020739999 - 2³ = 61020739991 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61020739991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 649156762 + ... + 649156855.

It is an arithmetic number, because the mean of its divisors is an integer number (15579763416).

Almost surely, 2^61020739999 is an apocalyptic number.

61020739999 is a deficient number, since it is larger than the sum of its proper divisors (1298313665).

61020739999 is a wasteful number, since it uses less digits than its factorization.

61020739999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1298313664.

The product of its (nonzero) digits is 1653372, while the sum is 55.

The spelling of 61020739999 in words is "sixty-one billion, twenty million, seven hundred thirty-nine thousand, nine hundred ninety-nine".