7742741557 has 8 divisors (see below), whose sum is σ = 7762210200. Its totient is φ = 7723290624.

The previous prime is 7742741549. The next prime is 7742741561. The reversal of 7742741557 is 7551472477.

It can be written as a sum of positive squares in 4 ways, for example, as 8242641 + 7734498916 = 2871^2 + 87946^2 .

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 7742741557 - 2³ = 7742741549 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7742741557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7742741537) 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, 1365873 + ... + 1371529.

It is an arithmetic number, because the mean of its divisors is an integer number (970276275).

Almost surely, 2^7742741557 is an apocalyptic number.

It is an amenable number.

7742741557 is a deficient number, since it is larger than the sum of its proper divisors (19468643).

7742741557 is a wasteful number, since it uses less digits than its factorization.

7742741557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8855.

The product of its digits is 1920800, while the sum is 49.

The square root of 7742741557 is about 87992.8494651696. The cubic root of 7742741557 is about 1978.3278026040.

The spelling of 7742741557 in words is "seven billion, seven hundred forty-two million, seven hundred forty-one thousand, five hundred fifty-seven".