77469549749 has 4 divisors (see below), whose sum is σ = 78560670240. Its totient is φ = 76378429260.

The previous prime is 77469549743. The next prime is 77469549761. The reversal of 77469549749 is 94794596477.

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 not a de Polignac number, because 77469549749 - 2¹² = 77469545653 is a prime.

It is a super-2 number, since 2×77469549749² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (71), and also a Moran number because the ratio is a prime number: 1091120419 = 77469549749 / (7 + 7 + 4 + 6 + 9 + 5 + 4 + 9 + 7 + 4 + 9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77469549743) 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, 545560139 + ... + 545560280.

It is an arithmetic number, because the mean of its divisors is an integer number (19640167560).

Almost surely, 2^77469549749 is an apocalyptic number.

It is an amenable number.

77469549749 is a deficient number, since it is larger than the sum of its proper divisors (1091120491).

77469549749 is a wasteful number, since it uses less digits than its factorization.

77469549749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1091120490.

The product of its digits is 480090240, while the sum is 71.

The spelling of 77469549749 in words is "seventy-seven billion, four hundred sixty-nine million, five hundred forty-nine thousand, seven hundred forty-nine".