25277750250421 has 2 divisors, whose sum is σ = 25277750250422. Its totient is φ = 25277750250420.

The previous prime is 25277750250391. The next prime is 25277750250439. The reversal of 25277750250421 is 12405205777252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19796715422500 + 5481034827921 = 4449350^2 + 2341161^2 .

It is a cyclic number.

It is not a de Polignac number, because 25277750250421 - 2⁹ = 25277750249909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25277750250481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12638875125210 + 12638875125211.

It is an arithmetic number, because the mean of its divisors is an integer number (12638875125211).

Almost surely, 2^{25277750250421} is an apocalyptic number.

It is an amenable number.

25277750250421 is a deficient number, since it is larger than the sum of its proper divisors (1).

25277750250421 is an equidigital number, since it uses as much as digits as its factorization.

25277750250421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2744000, while the sum is 49.

The spelling of 25277750250421 in words is "twenty-five trillion, two hundred seventy-seven billion, seven hundred fifty million, two hundred fifty thousand, four hundred twenty-one".