61920804309505 has 8 divisors (see below), whose sum is σ = 74335631700672. Its totient is φ = 49516199094768.

The previous prime is 61920804309457. The next prime is 61920804309523. The reversal of 61920804309505 is 50590340802916.

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

It is a cyclic number.

It is not a de Polignac number, because 61920804309505 - 2¹³ = 61920804301313 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2555530779 + ... + 2555555008.

It is an arithmetic number, because the mean of its divisors is an integer number (9291953962584).

Almost surely, 2^{61920804309505} is an apocalyptic number.

It is an amenable number.

61920804309505 is a deficient number, since it is larger than the sum of its proper divisors (12414827391167).

61920804309505 is a wasteful number, since it uses less digits than its factorization.

61920804309505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5111088215.

The product of its (nonzero) digits is 2332800, while the sum is 52.

The spelling of 61920804309505 in words is "sixty-one trillion, nine hundred twenty billion, eight hundred four million, three hundred nine thousand, five hundred five".