61378546091497 has 4 divisors (see below), whose sum is σ = 61449999580240. Its totient is φ = 61307092602756.

The previous prime is 61378546091459. The next prime is 61378546091581. The reversal of 61378546091497 is 79419064587316.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61378546091497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61378546001497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35726743083 + ... + 35726744800.

It is an arithmetic number, because the mean of its divisors is an integer number (15362499895060).

Almost surely, 2^{61378546091497} is an apocalyptic number.

It is an amenable number.

61378546091497 is a deficient number, since it is larger than the sum of its proper divisors (71453488743).

61378546091497 is an equidigital number, since it uses as much as digits as its factorization.

61378546091497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71453488742.

The product of its (nonzero) digits is 274337280, while the sum is 70.

The spelling of 61378546091497 in words is "sixty-one trillion, three hundred seventy-eight billion, five hundred forty-six million, ninety-one thousand, four hundred ninety-seven".