61020552757 has 4 divisors (see below), whose sum is σ = 61049765260. Its totient is φ = 60991340256.

The previous prime is 61020552679. The next prime is 61020552781. The reversal of 61020552757 is 75725502016.

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 46984464081 + 14036088676 = 216759^2 + 118474^2 .

It is a cyclic number.

It is not a de Polignac number, because 61020552757 - 2⁷ = 61020552629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61020552157) 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, 14603118 + ... + 14607295.

It is an arithmetic number, because the mean of its divisors is an integer number (15262441315).

Almost surely, 2^61020552757 is an apocalyptic number.

It is an amenable number.

61020552757 is a deficient number, since it is larger than the sum of its proper divisors (29212503).

61020552757 is a wasteful number, since it uses less digits than its factorization.

61020552757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29212502.

The product of its (nonzero) digits is 147000, while the sum is 40.

The spelling of 61020552757 in words is "sixty-one billion, twenty million, five hundred fifty-two thousand, seven hundred fifty-seven".