15261400577861 has 2 divisors, whose sum is σ = 15261400577862. Its totient is φ = 15261400577860.

The previous prime is 15261400577851. The next prime is 15261400577873. The reversal of 15261400577861 is 16877500416251.

15261400577861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13328413656100 + 1932986921761 = 3650810^2 + 1390319^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15261400577861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15261400577851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7630700288930 + 7630700288931.

It is an arithmetic number, because the mean of its divisors is an integer number (7630700288931).

Almost surely, 2^{15261400577861} is an apocalyptic number.

It is an amenable number.

15261400577861 is a deficient number, since it is larger than the sum of its proper divisors (1).

15261400577861 is an equidigital number, since it uses as much as digits as its factorization.

15261400577861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2822400, while the sum is 53.

The spelling of 15261400577861 in words is "fifteen trillion, two hundred sixty-one billion, four hundred million, five hundred seventy-seven thousand, eight hundred sixty-one".