61751070545 has 4 divisors (see below), whose sum is σ = 74101284660. Its totient is φ = 49400856432.

The previous prime is 61751070541. The next prime is 61751070553. The reversal of 61751070545 is 54507015716.

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

It can be written as a sum of positive squares in 2 ways, for example, as 43895697169 + 17855373376 = 209513^2 + 133624^2 .

It is a cyclic number.

It is not a de Polignac number, because 61751070545 - 2² = 61751070541 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61751070541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6175107050 + ... + 6175107059.

It is an arithmetic number, because the mean of its divisors is an integer number (18525321165).

Almost surely, 2^61751070545 is an apocalyptic number.

It is an amenable number.

61751070545 is a deficient number, since it is larger than the sum of its proper divisors (12350214115).

61751070545 is a wasteful number, since it uses less digits than its factorization.

61751070545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12350214114.

The product of its (nonzero) digits is 147000, while the sum is 41.

The spelling of 61751070545 in words is "sixty-one billion, seven hundred fifty-one million, seventy thousand, five hundred forty-five".