40187453861 has 2 divisors, whose sum is σ = 40187453862. Its totient is φ = 40187453860.

The previous prime is 40187453827. The next prime is 40187453879. The reversal of 40187453861 is 16835478104.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39612940900 + 574512961 = 199030^2 + 23969^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40187453861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40187453821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20093726930 + 20093726931.

It is an arithmetic number, because the mean of its divisors is an integer number (20093726931).

Almost surely, 2^40187453861 is an apocalyptic number.

It is an amenable number.

40187453861 is a deficient number, since it is larger than the sum of its proper divisors (1).

40187453861 is an equidigital number, since it uses as much as digits as its factorization.

40187453861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 645120, while the sum is 47.

The spelling of 40187453861 in words is "forty billion, one hundred eighty-seven million, four hundred fifty-three thousand, eight hundred sixty-one".