61261553749 has 8 divisors (see below), whose sum is σ = 66832911648. Its totient is φ = 55690550160.

The previous prime is 61261553741. The next prime is 61261553777. The reversal of 61261553749 is 94735516216.

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 61261553749 - 2³ = 61261553741 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 (61261553741) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 381399 + ... + 517675.

It is an arithmetic number, because the mean of its divisors is an integer number (8354113956).

Almost surely, 2^61261553749 is an apocalyptic number.

It is an amenable number.

61261553749 is a deficient number, since it is larger than the sum of its proper divisors (5571357899).

61261553749 is a wasteful number, since it uses less digits than its factorization.

61261553749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177155.

The product of its digits is 1360800, while the sum is 49.

The spelling of 61261553749 in words is "sixty-one billion, two hundred sixty-one million, five hundred fifty-three thousand, seven hundred forty-nine".