77490508061 has 4 divisors (see below), whose sum is σ = 77514963900. Its totient is φ = 77466052224.

The previous prime is 77490508037. The next prime is 77490508103. The reversal of 77490508061 is 16080509477.

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 69172156036 + 8318352025 = 263006^2 + 91205^2 .

It is a cyclic number.

It is not a de Polignac number, because 77490508061 - 2¹⁴ = 77490491677 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77490507997 and 77490508015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77490504061) 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, 12223166 + ... + 12229503.

It is an arithmetic number, because the mean of its divisors is an integer number (19378740975).

Almost surely, 2^77490508061 is an apocalyptic number.

It is an amenable number.

77490508061 is a deficient number, since it is larger than the sum of its proper divisors (24455839).

77490508061 is a wasteful number, since it uses less digits than its factorization.

77490508061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24455838.

The product of its (nonzero) digits is 423360, while the sum is 47.

The spelling of 77490508061 in words is "seventy-seven billion, four hundred ninety million, five hundred eight thousand, sixty-one".